所以我用Java创建了一个程序，目的是从一些给定的输入生成一个图像。我已经设法让程序编译和解析输入而不会崩溃，但它似乎没有保存输出图像。
以下是与保存文件有关的内容：
public static void saveImage( BufferedImage img, File file ) throws IOException {
ImageWriter writer = null;
java.util.Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if( iter.hasNext() ){
writer = (ImageWriter)iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream( file );
writer.setOutput(ios);
ImageWriteParam param = new JPEGImageWriteParam( java.util.Locale.getDefault() );
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
param.setCompressionQuality(0.98f);
writer.write(null, new IIOImage( img, null, null ), param);
}
public static void save(String[] args) throws Exception {
BufferedImage colorImage, julia;
if (args.length != 1)
System.out.println( "usage is: java Julia filename" );
else
{
julia = Julia();
saveImage( julia, new File( "julia" + args[0] ) );
}
这是我的代码全部：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Scanner;
import java.lang.Math.*;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
public class Julia{
public static void saveImage( BufferedImage img, File file ) throws IOException {
ImageWriter writer = null;
java.util.Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if( iter.hasNext() ){
writer = (ImageWriter)iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream( file );
writer.setOutput(ios);
ImageWriteParam param = new JPEGImageWriteParam( java.util.Locale.getDefault() );
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
param.setCompressionQuality(0.98f);
writer.write(null, new IIOImage( img, null, null ), param);
}
public static BufferedImage Julia( )
{
//z= (Xmin +i(Xmax- Xmin) /size) + (Ymin+ j(Ymax-Ymin)/size);
BufferedImage outImage;
float zreal, zimag;
float cReal, cImag;
float xMin, xMax, yMin, yMax;
int height, width, size;
height = width = size = 512;
outImage = new BufferedImage( width, height, BufferedImage.TYPE_3BYTE_BGR );
//initializing variables
cReal = 0;
cImag = 0;
xMin = 0;
xMax = 0;
yMin = 0;
yMax = 0;
//c= creal+cimag
Complex c;
c = new Complex (cReal, cImag);
int i, j ,k;
Complex f;
for (i = 0; i<width; i++)
{
for(j = 0; j<height; j++)
{
for (k= 0; k< 256; k++)
{
zreal = (xMin +i*(xMax- xMin) /size);
zimag = (yMin+ j*(yMax-yMin)/size);
Complex z = new Complex( zreal, zimag);
//z = z^2
//f= z^2 +c
z = z.multi(z);
f = z.addd(c);
if (Math.sqrt(Math.pow(zreal, 2.0)+Math.pow(zimag, 2.0))>2)
break;
}
int pixel = getHSBColor(k);
outImage.setRGB(i, j, pixel);
}
}
return( outImage );
}
public static void main(String[] args)
{
BufferedImage outImage, julia;
double cReal, cImag;
float xMin, xMax, yMin, yMax;
Scanner scan = new Scanner (System.in);
System.out.println("Input: cReal cImag xMin xMax yMin yMax fname");
cReal=scan.nextDouble ();
cImag=scan.nextDouble ();
xMin=scan.nextFloat ();
xMax=scan.nextFloat ();
yMin=scan.nextFloat ();
yMax=scan.nextFloat ();
String fname = scan.next();
double f;
int z;
int c;
int height, width, size;
height = width = size = 512;
outImage = Julia(); // Put 6 junk inside cReal, cImag, xMin, xMax, yMin, yMax
}
//something I tried to save the file that didn't seem to work properly//
/* try {
File outputfile = new File( "Julia" + args[0] );
ImageIO.write(julia, "jpg", outputfile);
} catch (IOException e) {
}*/
public static void save(String[] args) throws Exception {
BufferedImage colorImage, julia;
if (args.length != 1)
System.out.println( "usage is: java Julia filename" );
else
{
julia = Julia();
saveImage( julia, new File( "julia" + args[0] ) );
}
}
// hsb color table
public static int getHSBColor(int idx)
{
return Color.getHSBColor((float)(idx/255.0), 1.0f, 1.0f).getRGB();
}
}
class Complex
{
double real;
double imaginary;
Complex(double newReal, double newImaginary)
{
real = newReal;
imaginary = newImaginary;
}
public Complex addd(Complex complexToAdd)
{
double x , y , newreal, newimaginary;
newreal = complexToAdd.real;
newimaginary = complexToAdd.imaginary;
x = real + newreal;
y = imaginary + newimaginary;
Complex newComplex = new Complex(x, y);
return newComplex;
}
public Complex multi(Complex complexToMulti)
{
double x, y , newreal, newimaginary;
newreal = complexToMulti.real;
newimaginary = complexToMulti.imaginary;
x = real*newreal - imaginary*newimaginary;
y = real*newimaginary + imaginary*newreal;
Complex newComplex= new Complex(x, y);
return newComplex;
}
// extra absolute value method //
/*public Complex abso (Complex complexAbso) {
double x, y, newreal, newimiginary;
real = complexAbso.real;
imaginary= complexAbso.imaginary;
x = real*real;
y = imaginary*imaginary;
Complex newComplex = new int (x, y);
return newComplex;
}*/
}
有人有什么想法吗？任何和所有的帮助将不胜感激。
感谢您的时间。
答案 0 :(得分：0)
要将图像保存到磁盘，可以使用以下方法：
javax.imageio.ImageIO.write(Image, format, file);
格式可以是“jpg”或“png”。该方法的其他变体也是可用的。
这种方法非常方便使用。
答案 1 :(得分：0)
除了在您想要将图像写入文件时ImageIO可能更容易使用的事实之外，您当前尝试用于编写图像文件的代码并没有什么问题。
但剩下的就剩下了！
显然你做了很多反复试验。从代码中可以很快看到你并不真正知道你在做什么。你并没有真正计算任何东西，因为你在main方法中输入的值并没有真正用在Julia方法中，而且在Julia方法中完成的迭代是有缺陷的。
所以一些一般提示：
Scanner。只需为变量定义一些“默认”值，这样您每次启动程序时都不必反复输入它们！稍微清理一下：
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
public class Julia
{
public static BufferedImage julia()
{
int width = 200;
int height = 100;
BufferedImage outImage =
new BufferedImage( width, height, BufferedImage.TYPE_3BYTE_BGR );
Complex c = new Complex (cReal, cImag);
for (int i = 0; i<width; i++)
{
for(int j = 0; j<height; j++)
{
double zreal = (xMin +i*(xMax- xMin) / width);
double zimag = (yMin+ j*(yMax-yMin)/ height);
Complex z = new Complex( zreal, zimag);
int k=0;
for (k= 0; k< 256; k++)
{
z = z.multi(z);
z = z.add(c);
// if (Math.sqrt(Math.pow(z.real, 2.0)+
// Math.pow(z.imaginary, 2.0))>2)
// break;
// MUCH faster:
if (z.real*z.real+z.imaginary*z.imaginary>4)
break;
}
int pixel = getHSBColor(k);
outImage.setRGB(i, j, pixel);
}
}
return outImage;
}
static double cReal, cImag;
static float xMin, xMax, yMin, yMax;
public static void main(String[] args) throws IOException
{
// Scanner scan = new Scanner (System.in);
// System.out.println("Input: cReal cImag xMin xMax yMin yMax fname");
// cReal=scan.nextDouble ();
// cImag=scan.nextDouble ();
// xMin=scan.nextFloat ();
// xMax=scan.nextFloat ();
// yMin=scan.nextFloat ();
// yMax=scan.nextFloat ();
// String fname = scan.next();
xMin = -2;
yMin = -1;
xMax = 2;
yMax = 1;
cReal = -0.742;
cImag = 0.1;
BufferedImage image = julia();
ImageIO.write(image, "jpg", new File("Julia01.jpg"));
showImage(image);
}
public static int getHSBColor(int idx)
{
return Color.getHSBColor((float)(idx/255.0), 1.0f, 1.0f).getRGB();
}
private static void showImage(final BufferedImage image)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new JLabel(new ImageIcon(image)));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
}
class Complex
{
double real;
double imaginary;
Complex(double newReal, double newImaginary)
{
real = newReal;
imaginary = newImaginary;
}
public Complex add(Complex complexToAdd)
{
double newreal = complexToAdd.real;
double newimaginary = complexToAdd.imaginary;
double x = real + newreal;
double y = imaginary + newimaginary;
Complex newComplex = new Complex(x, y);
return newComplex;
}
public Complex multi(Complex complexToMulti)
{
double newreal = complexToMulti.real;
double newimaginary = complexToMulti.imaginary;
double x = real*newreal - imaginary*newimaginary;
double y = real*newimaginary + imaginary*newreal;
Complex newComplex= new Complex(x, y);
return newComplex;
}
}